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APPENDIX A
HORIZONTAL AND VERTICAL VENT CHART
For example, let‟s imagine an installation consisting of a horizontal vent coming out at the back of the stove
on a total distance of 8 feet. This horizontal run is followed by a Tee and a 6-foot vertical rise. This type of
installation is not acceptable. As you can see, the vent termination is clearly outside the allowed configuration
zone on the chart because the venting system proposed does not have at least one foot of vertical rise for
each foot of horizontal run.
Instead, if the installation consisted of a horizontal vent coming out at the back of the stove on a total distance of
4 feet, followed by a Tee and a 6-foot vertical rise, it would be acceptable. The installation end should be within
the allowable configuration zone on the chart since it would have at least one foot of vertical rise for each foot of
horizontal run. Furthermore, the total vertical rise would be at least 3-foot high.
WARNING: TO REDUCE THE RISK OF SMOKE SPILLAGE, NEVER TERMINATE WITH A HORIZONTAL
RUN. IF YOUR SYSTEM TERMINATES WITH A HORIZONTAL RUN, ADD AT LEAST 3 FEET
OF VERTICAL RISE.
Possible Vertical vent
length (feet)
Possible Horizontal
vent length (feet)